Hi, monks, I have a question about upload a big file.

use Win32::IE::Mechanize;

    my $url = 'http://192.168.1.1/cgi-bin/luci/engineer/advanced/diagn
+ostics/upgrade'; 
    #my $username = 'engineer'; 
    #my $password = 'ARC$eng&123';
    my $file = 'C:\Documents and Settings\michaelhuang\Desktop\rev1-54
+.zip';
    my $ie = Win32::IE::Mechanize->new( visible => 1);

    $ie->get( $url);
    $ie->form_number(4);
        $ie->set_fields(
        username => 'engineer',
        password => 'ARC$eng&123' 
    );
    $ie->submit();
    $ie->form_number(4);   
    $ie->set_fields(
                #filename=>'rev1-54.zip'
            image => $file,
                );
     $ie->submit();
[download]

output from IE is :The file uploaded may be of the wrong type or damaged. My question is

1.Why I can't submit this form to implement the upload?

2.I wanna use this script to control the IE to do the upload, need I need other model except Win32::IE::Mechanize?

3.In the Win32::IE::Mechanize source code, how to set up the argument of $mech->value( $name, $number ), does this method can help my script?

4.If I use other way to do the upload, I need to find the new URL for upload, which way is the easiest way to find the URL?(It can redirect to the new URL after I manually login, but failed to find using this script)

I am a newbie of Perl, I will appreciate for anyone give thread to me.

Update: I have found the issue is in trace back in source of webpage. The type of input is "file", so I can't use submit_form with text inside.